package com.netty.pro.netty.simple;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * @author xuzn
 * @ClassName: NettyClientHandler
 * @ProjectName netty-pro
 * @date 2020/3/10/17:36
 */
public class NettyClientHandler extends ChannelInboundHandlerAdapter {

  @Override
  public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
    System.out.println("客户端注册到服务器上了~");
  }

  // 当通道就绪时就会触发该方法
  @Override
  public void channelActive(ChannelHandlerContext ctx) throws Exception {
    System.out.println("客户端ctx:" + ctx);
    ctx.writeAndFlush(Unpooled.copiedBuffer("hello server", CharsetUtil.UTF_8));
  }

  // 当通道有读取事件时会触发
  @Override
  public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
    ByteBuf buf = (ByteBuf) msg;
    System.out.println("服务器回复的消息:" + buf.toString(CharsetUtil.UTF_8));
    System.out.println("服务器地址:" + ctx.channel().remoteAddress());
  }

  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    cause.printStackTrace();
    ctx.close();
  }
}
